DTC P0128 – Coolant Thermostat (Coolant Temperature Below Thermostat)
P0128 – Coolant Thermostat The P0128 code is a diagnostic trouble code (DTC) that indicates a malfunction in the coolant thermostat, specifically a coolant temperature below the thermostat regulating temperature. This means that the engine coolant temperature is not reaching the optimal temperature within the set time, which can lead to reduced engine performance and … Read more